Driving and stopping mechanism.



Patented June 9,1914, 4 snnnT- snnm' 1. i

,mf/65%" www 2 7" (M y@ Mw L. B. TOPHAM. muvmc AND morirme mommsm. APPLIOATIOH FILED AUG. 6. 1912.

L. E. TOPHAM. IVING AND STOPPING MEOHANlSM. Ammonia FILED AUG.5.19

Patented-June 9,1914.

4 SHEETS-SHEET 2.

` L. E. TOPHAM. DRIVING AND STOPPING MBOBANISH. APPLICATION FILED AUG. 6, 1912.

. Patented June 9, 1914 4 SHEETS-BEEET 3.

L. EHTOPHAM.- WING AND S'IOPPNGv MBGEANISM. APPLICATION FILED AUG. 5, 1912.

Patented June 9,1914.

4 SHEETS-SHEET 4.

LAURENCE E. TOPHAM, OF SVVAMPSCOTT.

SHOE MACHINERY CMIPANY, OF NEVI JERSEY.

DRIVING AND PATERSON, NEW' JERSEY, A

MASSACHUSETTS, ASSIGNOR TO UNITED CORPORATION 0F STOPPING MECl-IANISM.

1 ,cortese Be it known that fl. Linnnncn E. Toi-11AM, a citizen oi the United States, residing at Swampscott, in the county oli' Essex and State ot' lvlassachusetts, have invented certain new and useful Improvements in Drivingr and Stopping- Mechanism; and I do hereby declare the following,y to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the The invention relates to driving and stopping mechanism adapted for use upon high speed machines.

The object of the invention is to provide a novel and improved mechanism which will act in a uniformly reliable manner upon the throwing!` out of the main driving mechanism to arrest the forward movement of the machine oil driven mechanism at a predetermined. point in its operation and then move it bach to a predetermined point.

To this end the invention contemplates the provision of a slow speed forward driving mechanism and a low speed reverse driving mechanism which are thrown into action suc eessively when the hi eh speed forward drive is thrown out, and which act to gradually overcome the inertia of the driven parts, to continue the forward movement at a slow speed, to reverse the movement at a predetermined point, and to finally bring' the parts to rest in a predetermined position. The provision of slow speed driving mechanisms 4tor continuing the forward movement oi the driven parts to the point where the revuse takes place, and for returning the parts to final stopping position, insures a uniform reversing and stopping),` of the parts unaffected by variations in the speed of the parts when the reversing' and stopping mechanism Specification of Letters Patent. Application iiled August 5,

is thrown into action.

he various features of the invention will be readily understood from an :inspection of the accompanying drawings, and the followingdetailed description of the construction illustrated therein. i

ln the'drawings, Figure 1 is a side elevation of a welt and turn sewing machine pro-` vided with a driving and stop nism embodying the invention ferred form; Fig. 2 is a front elevation showing,r the driving andstopping mecha- Iaten te d J une 9, 1914.

1912. Seria] No. 713,360.

nism on a larger scale; Fig. 3 is a Vertical longitudinal section through the drivingr and stoppiim mechanism; Figi 4 is an end elevation lookingr toward the right in Fig. 2; and Fig. 5 is a detail sectionalwiew on line 5--5, Fig. 2.

The mechanism shown in the drawings is especially designed for use upon a welt and turn machine, and is constructed to stop the forward movement o t' the machine needle has advanced sufficiently to cast oli' its loop, and to then turn the machine back to a point where the needle is retracted and e parts of the-machine in proper position for the removal and insertion of a shoe. It will be understood, however, that this mechanism is not confined in its application to a machine of this character, but maybe used in other machines and in othe relations where it is desirable to give the machine or driven parts a reverse movement upon stoppingr the machine.

As shown in the drawings, of the sewing machine is driven through a shaft 1, the lower end of which is journaled in a casing 2, and is provided with a bevel gear 3 en,f` fag'in,gr a driving gear 4. The gear 4t is secured to a sleeve 5 loosely mounted on a shaft 6, and carries one member 7 main driving clutch. of the clutch is carried by a driving the cam shaft 5. he casing;Y 2 1s secured upon the end of a rod is mounted to slide in the frame of the machine, and is moved longitudinally through a mechanism controlled y a starting andstopping treadle ll. T acted upon by a spring 12 which tends to vmove it in a direction to disengage the members of the driving clutch. When the machine is to be started, the treadle is dedrawing down a wedge--13 which acts against a collar 14 on the rod'lO treadle,

a spring 15, allowing the members e rod l0 is of the Y Localia? link 46 with the block 42. When the sleeve 34 is rocked in a direction vindicated by the arrow in Fig. 4 to expand the clutch shoes 27, the link 46 acts to swingr thus throwing the main driving clutch .out of operation. v

When the main driving mechanism is thrown out, the slow .s driving and- "reversing mechanisml is thrown into operathe latch. 41 out from beneath the block 42. tion. .In the construction shown this mecha- When th1s takes place the latch 1s prevented )brake drum 24 is provided-witl'f'iange lso p vided with an larm 36 ywhich 1s connected secured to an arm Awith the driving gear 4to-transmit a slow a pinion 2O formed onlthe end 'inion18 enva es a imon V a rock shaft .32.'

.the'normal runningof the machine, and

nism comprises differential gearing driven position beneath the from returning 1ntol from the driving pulley. 9 and connected block 42 by a second l engages a notch 464 inthe hub of the latch. The latch slide 47 is -mounted in a lixed bearing, and ,is pressed upward by a spring v49. After the latch 41 has been swung out lof active position and latched in this posi-v tion, the sleeve 34 is free to move in the direction of the arrow beyond the position indicated in Figr4, and to thus expand the clutch shoes 28. When this takesv place the .endof the block 42 strikes the upper end of the latch slide 47, depressing the s and releasing the latch 41 so that it swings in ready to snap under the block 42 when th 34 is returned to lmid-position. for rocking the sleevev 34 to successively actuate the clutch shoes I27 and 28 comprises a lever 50 provided With motion thereto 1n e1 her a forward or reversedirection. Asshown, the driving pulley carriesfa shaft l6upon which are secured three pinions 17, 18 and .19, of diiiereiit sizes. The long faced pinion 17 engages of the sleeve 4 is secured,the

v 21 formed on a sleeve v22 whichl surrounds the shaft 6, and the vpinion 19l engages a pinion v23 formed on the hub of a, brakedrum 24 which is which the drivinglgear 22 is gournaled in a fixed'bearing 25, and at its outer end carries abrake drum 26.

surrounding clutch shoes 27, andthe brake drum 26 is provided with a similar iiange surrounding clutch shoes .28. The clutch shoes 27 and 2S are pivoted on fixed pivots indicated at 29 in Fig. 4, and the free ends of the vclutch shoes carry bearing 7pieces 30 adapted to engage the flattened ends 31 of When the rock shaft is held in mid-position, as indicated in Fig. 4, both sets of clutch shoes are 4contracted by their spring 33, .and the drums 24 and 26 are free to rotate with the pulley 9. The rock shaft is held in this position during so long as the operator keeps his foot upon the treadle and holds the members of the main driving clutch in engagement, the differential gearing and drums 24 and 26 travel with the driving pulley 9.-

When the operator removes his foot from the treadle toithrow the main driving clutch out of operation, the mechanism for actuatto successively Aexpand and connected .by a forked lprojection 52 with the casing 2, so that the lever moves longitudinally of the shaft 35l with the casing and driving gear 4. The'rear Aend of 'the lever carries a roll 53 engaging a cam groove 54 formed in the rear clutch member 7 The lever is provided on its lunder side with a bearing surface 55'arranged to coperate with the upper' end of `an armA 56 which is mounted-011 a .second arm 57 projecting from the sleeve 34. The arm 56 is secured on a rock shaft 58-1nounted' in the lower end gfwthe arm 57, and is held .by a spring-"5g" against a stop 60 on the arm 57. The' lever 50 is so `arranged with relation to the arm 56 that when the members of the driving clutch are in engagement, the lever is to the left of the arm in Fig. 2. During the normal running .of the machine, therefore, thelever 50 rides idly against the outer surface ofthe cam groove 54, the weight of, the lever being supported by the cam groove. rod 10 and casing 2 move toward 'tiefright to disengage the .members of the driving clutch, the lever 50 is also moved toward the right, and if the roll 53 on the end of the lever does not-happen part 54n of the cam groove'54', the side of the lever will strike the `arm 56, `andv the arm will yield and ride aga-inst the-side of thellever until the roll comes to a low part 541. The arm 56 will then snap under the llever 50,A and as the lever rides up on a high partv 54j ofthe calm groove `the lever will engage the arm 56and swing the sleeve ing the rock shaft the clutch shoes 27 and 28, and thus throw the differential gearing into operation, is rendered active. The devices for operatin the rock shaft comprise a sleeve 34 mounted to turn about axed shaft 3 5, and prothrough an expansible spring link 37 with an arm 38 on the rock shaft. The sleeve is connected to a collar 39 on the shaft .35 by a torsional spring 40 which tends to rock'the sleeve in the direction of the arrow in Fig. 4. The sleeve is retained in normal position against the tension of the'spri'ng by a latch 41 arrangedto engage a block 42 whichis p 43 projecting from the sleeve. The latch is mounted v on' axed pivot 44, and isY rovided with an arm 45 'by the arrow in Fig. 4, Whcblsonnecte by melding expansibie p clutch shoes 27.

face of the' When the 115 to be in a lo\v 34- in a direction oppsite to that indicated thus expanding theV opposite` to that latch slide l47 which v y ndel a hub 5l loosely mounted on the shaft 35, 4

ict

`ias

vat a slow speed. The

When the clutch shoes are expanded there will be more or less slip between the clutch shoes and the brake drum 24, so that these parts, in connection gearing, will act as a friction brake to gradually overcomethe momentum of the moving parts until the speed of the driven parts is the same as that which will be given to them by the differential gearing. Vhen the slip between the drum 24 and clutch shoes 27 ceases, and the drum comes to rest, the

gear 2Q, the driving a forward direction slow forward speed parts driven therefrom will continue until the roll 53'on the lever 50 reaches the end 54c of the high part 54h of the cam groove, when the roll will drop ofi' of the end of the high partand enter the lowest part 54d of the cam. This movement of the lever will rock the sleeve 34 in the direction of the arrow, Fic'. 4, beyond its .mid-position, thus releasing the clutch shoes 27 and expanding'the clutch shoes 28. This frees the drum 24 and arrests the movement of the drum 26 and its connected gear 21. The gears carried by the driving pulley 9 will now rotate about the gear 21, and since this gear is larger than the gear 20, the forward rotation of the driving gear 4 will be arrested, and the gear rotated at a slow speed in a reverse direction. As the driven parts are moving at a slow speed when the clutch shoes 27 are released and the clutch shoes 28 expanded, there will be practically no slip between the clutch shoes 28 and drum 26, and the reversal of the driving gear and parts connected therewith will at a the timing. of the of the driving gear and upon the location of the low part 54u and high part 541 of the cam, and the cam is so arranged that the throwing in of this mechanism is effected at a pomt sufficiently in advance of Athe throwing in of the reversing mechanism Ato insure an adequate braking interval during Which the speed of the driven reduced ing gear is reversed, as above described, the roll 53 on the lever u50 rides up the art 54 of the cam groove 54, returning tlie rock 32 to normal position, and disenga ing the clutch shoes 28. he momentum o the machine then brings the end 54f of the cam groove into engagement with the roll, so

that the parts are finally brought to rest in a predetermined position. The parts are with the differential' 4 and automatic mechanism now in normal position, ready to effect their functions when the main driving' mechanism is again thrown out of operation.

In order to prevent a partial engagement of the lever 50 and arm 56 before the treadle operated wedge 13 is raised suiliciently to enable the full engagement of the arm and lever, a latch 61 is provided for holding the rod 10 and casing 2 against movement toward the right in Fig. l until the wedge 'has nearly completed its upward movement. This latch is pivoted to the collar 14, and is arranged to engage the end of an adjustable stop screw 62. The latch is arranged in the path of a pin (S3 projecting from the wedge 13, and the pin is so arranged that it engages and operatcs'the latch as the wedge completes its upward movement. During the normal running of the operator may manipulate vary the pressure between the members of the driving clutch, or to disengage the members of the clutch without danger of coupling the lever 50 with the devices for controlling the slowino down and reversing of the machine, since tlic latch 61 prevents a longitudinal movement of the rod 10 suiicient to bring the lever 50 into engagement with the arm 56. The latch also prevents n gradual movemen of the 1ewhich might result 1n a partial coupling of the arts together and then a disconnection of the parts before the arm fully engaged the lever. The latch holds the parts against longitudinal movement until the wedge has ,nearly completed its upward movement, and then when the latch is released the spring 12 quickly shifts the parts into position to fully engage the lever and arm.

While it is preferred to employ the construction'and arrangement of parts shown be understood that this tion, and may be varied and modified with! out departing therefrom.

aving explained the nature and object of the invention, and specifically described one form of mechanism in which it may be embodied, what is claimed is driving and stopping meehanisnl,

having, incombination, a main high speed driving mechanism, low speed forward driving mechanism, reverse driving mechanism, for rendering the low speed forward and reversing driving mechanisms successively active when the main driving mechanism is thrown out.

2. A driving and stopping mechanism, having, in combination, a main high speed driving mechanism, a low speed forward driving mechanism constructed to act as a friction brake when first thrown into operation and to then act to continue the forward motion at a low speed, a reverse driving mechanism, and mechanism for rendering the low speed driving and reversingmechanisms successively active when the main driving mechanism is thrown out.- A driving and stopping mechanism, having, 'in combination, a main` driving mechanism under starting and stopping control of the operator, low speed forward drivnism timedby the driven parts for throwing the slow speedv driving and reversing mechanisms successively 'into action and throwing the reverse drive out.

5. A' driving and stopping having, in combination, mechanism understarting and stopping control of the operator, low speed-forward driving and reversing mechanisms, a timing cam and connections operating when the main mechanism,

drive is thrownv out to throw in the low speed forward drive, throw out this drive and throw in the reverse drive, and finally throw out the reverse drive. 4 I

6. A driving and stopping mechanism, having in combination, a treadle controlled main driving mechanism, a low speed driving mechanism,lmechanism for throwing in the low speed driving mechanism including coupling members which are engaged upon the release of the treadle, and devices for preventing theengagement of the coupling members until the treadle has moved sufficiently to allow their complete lengagement.

7. A, driving and stopping mechanism,

having, -in combination, a main driving clutch under control of the operator, a treadle for controlling the main driving clutch, a low speed driving vand stopping mechanism,

for

a main drivingl and means rendered active by I the final clutch disengaging movement of the .amasar l treadle for throwing the low speed driving'.

and stopping mechanism into action.

8. A driving and stopping mechanism, l'

having, in combination, a main driving mechanism, alow speed mechanism including friction clutch members which act as a friction brake when first engaged, mechanism for engaging the clutch members whenthe main driving mechanism' is thrown out, a and mechanism members and throwing ing mechanism.

for disengaging lthe clutch in the reverse driv-- 9. A driving and .stopping mechanism,

having, in combination,

mechanism, low speed' forwardvdriving and' reversing mechanisms, a .timing cam connected with the driven parts..and ,.connec, tions normally inactive and rendered active upon the throwing mechanism for successively throwing in the low speed forward driving and reversing mechanisms. v

10. A driving and stopping mechanism, having, in combination, driving clutch connected with the pulley, three pinions of different sizes mounted concentric with the pulley, three connected pinions carried by the pulley and engaging the drums connectedv ,80

concentric pinions, brake to two of-the concentric pinions, clutchshoes for engaging the brake drums, vand mecha; nism for successively actuating);` the clutch shoes when t 4e main drivingclutch is thrownv out. 4

11. A driving .and stopping mechanism, having, in combination, mechanism, a low speedl drivingand lstopping mechanism, a camconnected with the driven parts, devices for actuating the low speed driving and stoppingmechanism normally disconnected from the lever, and vmeans for con-l ne'cting the devices with the lever when the 'l main driving mechanism is thrown out.

LAURENCE'E. TOPHAM.'

Witnessesz. I

CHESTER E. ROGERS,

` LAURAVM.VGooDRIneii.

,Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, y i Washingtom, l y

forward driving reverse driving mechanism, A6&1--

a main driving V l out of the main driving 'I0` a driving pulley, a

a main driving a' levenoperatedby the cam, 90,' 

